This is actually 5 variations on a Fuzzy theme. The schematic is (almost) exactly the same for each, just with different values for a couple of resistors and capacitors. [The only significant difference is an extra capacitor between the collector and base on the 2nd transistor in the D*A*M Metalheads].​

The Big Muff Pi is one of the most recognisable tones in rock history and is still one of the most popular go-to stompboxes out there. It has appeared in many shapes and colours over the year and with this layout and the bill of materials below you can create 12 of the most famous. ​